Indian caste system originated from Hinduism, also known as Varna system, which was formed in the late Vedic era and has a history of more than 3,000 years. This system divides people into four grades, namely Brahman, Khrushchev, Veda, sudra and Dapu Zhengsu. Varna scale drawn according to the song of primitive people in Rigveda: Brahma is the mouth of primitive people, Khshatriya is the arm of primitive people, Veda is the thigh of primitive people, and sudra is the foot of primitive people. As for untouchables, they were excluded from the body of primitive people. It was the most typical and strict hierarchical system in the ancient world, and all classes under the caste system attacked each other from generation to generation.